Next-to-leading-order QCD corrections to the yields and polarisations of J/Psi and Upsilon directly produced in association with a Z boson at the LHC

Gong, Bin; Lansberg, Jean-Philippe; Lorce, Cédric; Wang, Jianxiong

doi:10.1007/JHEP03(2013)115

Article (Scientific journals)

Next-to-leading-order QCD corrections to the yields and polarisations of J/Psi and Upsilon directly produced in association with a Z boson at the LHC

Gong, Bin; Lansberg, Jean-Philippe; Lorce, Cédric et al.

2013 • In Journal of High Energy Physics, 1303, p. 115

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https://hdl.handle.net/2268/159233

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10.1007/JHEP03(2013)115

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Abstract :

[en] We update the study of the production of direct $J/\Psi$ in association with a $Z$ boson at the Next-to-Leading Order (NLO) in $\alpha_S$ by evaluating both the yield differential in $P_T$ and the $J/\Psi$ polarisation in the QCD-based Colour-Singlet Model (CSM). Contrary to an earlier claim, QCD corrections at small and mid $P_T$ are small if one assumes that the factorisation and the renormalisation scales are commensurate with the $Z$ boson mass. As it can be anticipated, the t-channel gluon-exchange (t−CGE) topologies start to be dominant only for $P_T > m_Z/2$. The polarisation pattern is not altered by the QCD corrections. This is thus far the first quarkonium-production process where this is observed in the CSM. Along the same lines, our predictions for direct $\Upsilon + Z$ are also given.

Disciplines :

Physics

Author, co-author :

Gong, Bin

Lansberg, Jean-Philippe ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules

Lorce, Cédric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules

Wang, Jianxiong

Language :

English

Title :

Next-to-leading-order QCD corrections to the yields and polarisations of J/Psi and Upsilon directly produced in association with a Z boson at the LHC

Publication date :

2013

Journal title :

Journal of High Energy Physics

ISSN :

1126-6708

eISSN :

1029-8479

Publisher :

Institute of Physics Publishing (IOP), Bristol, United Kingdom

Volume :

1303

Pages :

115

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 02 December 2013

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